Double Star Calculator - Orbit

Orbital Elements for I977

WDS:	I977	WDS ID/Discoverer
P:	274.500	Orbital period (years)
a:	0.754	Semi-major axis (arcseconds)
i:	65.8	Inclination (degrees)
Ω:	102.9	Longitude of ascending node (degrees)
T:	1968.880	Epoch of periastron passage (year)
e:	0.364	Eccentricity
ω:	29.7	Longitude of periastron (degrees)
Start-Year:	1887.75	Year
End-Year:	2162.25	Year
Epoch:	2026.5	Besselian Epoch

Further data from the WDS Sixth Catalog of Orbits for I977
Position:	155541.93-264449.3	Epoch-2000 right ascension and declination
WDS-ID:	15557-2645	WDS designation
Discoverer Code:	I977	Discover designation and components
ADS number:	9836	Aitken Double Star catalog
HD number:	142456	HD catalog number
Hipparcos number:	78002	Hipparcos catalog number
V1:	7.99	Magnitude of the primary
V2:	8.48	Magnitude of the secondary
Equinox:	2000	Equinox
Date:	2010	Date of last observation
Orbit grade:	4	Orbit grade, ranging from : 1 = Definitive 2 = Good 3 = Reliable 4 = Preliminary 5 = Indeterminate
Flags:	n	Flags
Ephemerides:		Ephemerides
Code:	Sca2013d	Reference

Double Star Orbit for I977

WDS 6th Orbit including measures of I977

-- Image from the USNO WDS 6th Orbit Catalog (see Acknowledgements) --

Legend:

Green plus signs:	Visual (micrometric) measures
Violet asterisks:	Photographic measures
Blue symbols:	Various interferometric techniques
Dot-dash line:	Indicates the line of nodes

Ephemeris of I977

Click to expand/collapse ephemeris:

Year       Sep[“]   PA[°]
---------------------------------------------
2026.50    0.679   267.88
--------------------------
1887.75    0.469   331.00
1888.75    0.459   332.33
1889.75    0.450   333.70
1890.75    0.441   335.14
1891.75    0.433   336.63
1892.75    0.424   338.18
1893.75    0.416   339.79
1894.75    0.407   341.48
1895.75    0.399   343.23
1896.75    0.392   345.05
1897.75    0.384   346.94
1898.75    0.377   348.90
1899.75    0.370   350.94
1900.75    0.364   353.06
1901.75    0.358   355.25
1902.75    0.352   357.51
1903.75    0.347   359.85
1904.75    0.342     2.25
1905.75    0.337     4.72
1906.75    0.334     7.25
1907.75    0.330     9.83
1908.75    0.328    12.46
1909.75    0.325    15.14
1910.75    0.324    17.84
1911.75    0.323    20.57
1912.75    0.322    23.31
1913.75    0.322    26.05
1914.75    0.323    28.79
1915.75    0.324    31.51
1916.75    0.326    34.20
1917.75    0.328    36.86
1918.75    0.331    39.48
1919.75    0.335    42.05
1920.75    0.338    44.57
1921.75    0.343    47.02
1922.75    0.347    49.42
1923.75    0.352    51.74
1924.75    0.358    54.00
1925.75    0.363    56.19
1926.75    0.369    58.31
1927.75    0.376    60.37
1928.75    0.382    62.35
1929.75    0.388    64.27
1930.75    0.395    66.13
1931.75    0.402    67.92
1932.75    0.409    69.65
1933.75    0.415    71.33
1934.75    0.422    72.95
1935.75    0.429    74.52
1936.75    0.436    76.05
1937.75    0.442    77.52
1938.75    0.449    78.96
1939.75    0.455    80.35
1940.75    0.461    81.71
1941.75    0.467    83.03
1942.75    0.472    84.32
1943.75    0.477    85.59
1944.75    0.482    86.82
1945.75    0.487    88.04
1946.75    0.491    89.23
1947.75    0.494    90.40
1948.75    0.497    91.56
1949.75    0.500    92.70
1950.75    0.502    93.84
1951.75    0.504    94.96
1952.75    0.505    96.08
1953.75    0.505    97.20
1954.75    0.505    98.32
1955.75    0.504    99.43
1956.75    0.502   100.56
1957.75    0.500   101.69
1958.75    0.497   102.84
1959.75    0.493   104.00
1960.75    0.489   105.18
1961.75    0.484   106.38
1962.75    0.478   107.61
1963.75    0.472   108.87
1964.75    0.465   110.17
1965.75    0.457   111.51
1966.75    0.448   112.90
1967.75    0.439   114.35
1968.75    0.429   115.86
1969.75    0.419   117.44
1970.75    0.408   119.11
1971.75    0.397   120.87
1972.75    0.385   122.73
1973.75    0.373   124.72
1974.75    0.360   126.84
1975.75    0.348   129.11
1976.75    0.335   131.55
1977.75    0.323   134.18
1978.75    0.310   137.02
1979.75    0.298   140.10
1980.75    0.286   143.43
1981.75    0.275   147.05
1982.75    0.265   150.96
1983.75    0.255   155.18
1984.75    0.246   159.72
1985.75    0.239   164.56
1986.75    0.233   169.67
1987.75    0.229   175.01
1988.75    0.226   180.51
1989.75    0.226   186.09
1990.75    0.227   191.67
1991.75    0.230   197.15
1992.75    0.234   202.45
1993.75    0.240   207.51
1994.75    0.248   212.28
1995.75    0.257   216.74
1996.75    0.268   220.88
1997.75    0.279   224.70
1998.75    0.291   228.21
1999.75    0.304   231.44
2000.75    0.317   234.40
2001.75    0.331   237.11
2002.75    0.345   239.61
2003.75    0.360   241.90
2004.75    0.374   244.02
2005.75    0.389   245.97
2006.75    0.404   247.78
2007.75    0.419   249.46
2008.75    0.434   251.03
2009.75    0.449   252.49
2010.75    0.464   253.85
2011.75    0.479   255.13
2012.75    0.494   256.34
2013.75    0.508   257.47
2014.75    0.523   258.54
2015.75    0.537   259.56
2016.75    0.552   260.52
2017.75    0.566   261.43
2018.75    0.579   262.30
2019.75    0.593   263.13
2020.75    0.606   263.92
2021.75    0.620   264.67
2022.75    0.633   265.40
2023.75    0.645   266.10
2024.75    0.658   266.77
2025.75    0.670   267.41
2026.75    0.682   268.04
2027.75    0.694   268.64
2028.75    0.706   269.22
2029.75    0.717   269.78
2030.75    0.728   270.33
2031.75    0.739   270.86
2032.75    0.750   271.37
2033.75    0.760   271.87
2034.75    0.770   272.36
2035.75    0.780   272.83
2036.75    0.790   273.29
2037.75    0.799   273.74
2038.75    0.808   274.18
2039.75    0.817   274.61
2040.75    0.826   275.04
2041.75    0.834   275.45
2042.75    0.842   275.86
2043.75    0.850   276.25
2044.75    0.858   276.64
2045.75    0.865   277.03
2046.75    0.872   277.40
2047.75    0.879   277.78
2048.75    0.886   278.14
2049.75    0.892   278.50
2050.75    0.899   278.86
2051.75    0.905   279.21
2052.75    0.910   279.55
2053.75    0.916   279.89
2054.75    0.921   280.23
2055.75    0.926   280.56
2056.75    0.931   280.89
2057.75    0.936   281.22
2058.75    0.940   281.54
2059.75    0.944   281.86
2060.75    0.948   282.18
2061.75    0.952   282.50
2062.75    0.956   282.81
2063.75    0.959   283.12
2064.75    0.962   283.43
2065.75    0.965   283.74
2066.75    0.967   284.04
2067.75    0.970   284.35
2068.75    0.972   284.65
2069.75    0.974   284.95
2070.75    0.976   285.25
2071.75    0.978   285.55
2072.75    0.979   285.84
2073.75    0.980   286.14
2074.75    0.981   286.44
2075.75    0.982   286.73
2076.75    0.983   287.03
2077.75    0.983   287.32
2078.75    0.983   287.62
2079.75    0.983   287.91
2080.75    0.983   288.20
2081.75    0.983   288.50
2082.75    0.982   288.79
2083.75    0.981   289.09
2084.75    0.980   289.39
2085.75    0.979   289.68
2086.75    0.978   289.98
2087.75    0.976   290.28
2088.75    0.975   290.58
2089.75    0.973   290.88
2090.75    0.971   291.18
2091.75    0.968   291.48
2092.75    0.966   291.79
2093.75    0.963   292.09
2094.75    0.961   292.40
2095.75    0.958   292.71
2096.75    0.955   293.02
2097.75    0.951   293.33
2098.75    0.948   293.65
2099.75    0.944   293.97
2100.75    0.941   294.29
2101.75    0.937   294.61
2102.75    0.933   294.94
2103.75    0.928   295.26
2104.75    0.924   295.60
2105.75    0.919   295.93
2106.75    0.914   296.27
2107.75    0.910   296.61
2108.75    0.905   296.96
2109.75    0.899   297.31
2110.75    0.894   297.66
2111.75    0.888   298.02
2112.75    0.883   298.38
2113.75    0.877   298.75
2114.75    0.871   299.12
2115.75    0.865   299.50
2116.75    0.859   299.89
2117.75    0.852   300.27
2118.75    0.846   300.67
2119.75    0.839   301.07
2120.75    0.832   301.48
2121.75    0.825   301.89
2122.75    0.818   302.31
2123.75    0.811   302.74
2124.75    0.804   303.18
2125.75    0.796   303.62
2126.75    0.789   304.08
2127.75    0.781   304.54
2128.75    0.773   305.01
2129.75    0.765   305.49
2130.75    0.757   305.98
2131.75    0.749   306.49
2132.75    0.741   307.00
2133.75    0.733   307.52
2134.75    0.724   308.06
2135.75    0.716   308.61
2136.75    0.707   309.17
2137.75    0.698   309.75
2138.75    0.689   310.34
2139.75    0.680   310.95
2140.75    0.671   311.57
2141.75    0.662   312.21
2142.75    0.653   312.87
2143.75    0.644   313.54
2144.75    0.635   314.24
2145.75    0.625   314.96
2146.75    0.616   315.70
2147.75    0.606   316.46
2148.75    0.597   317.25
2149.75    0.587   318.06
2150.75    0.578   318.90
2151.75    0.568   319.76
2152.75    0.559   320.66
2153.75    0.549   321.59
2154.75    0.539   322.55
2155.75    0.530   323.54
2156.75    0.520   324.58
2157.75    0.511   325.65
2158.75    0.501   326.76
2159.75    0.492   327.91
2160.75    0.482   329.11
2161.75    0.473   330.36

Disclaimer

This result is provided without warranty. For all terms, see the Full Disclaimer. Copyright (C) 2025. Unless otherwise noted, all output generated by the Double Star Calculator including orbit diagrams, ephemerides, and analytical reports is licensed under CC BY 4.0.

Acknowledgements

The Double Star Calculator - Orbital Elements makes use of the Washington Double Star Sixth Catalog of Orbits of Visual Binary Stars, maintained at the U.S. Naval Observatory.

Report Information

Double Star Calculator:		Version 1.2 ($Rev: 2397 $)
Report created:		2026-06-25 17:21:15